Web Platform Installer

Web Platform Installer
Developer(s)	Microsoft
Initial release	January 21, 2009
Final release	5.0 / February 14, 2013; 12 years ago
Operating system	Windows XP SP3 and later; Windows Server 2003 SP2 and later
Platform	x86-64, IA-32
Size	4.5 MB
Available in	14 languages
	List of languages English, German, Japanese, French, Spanish, Italian, Korean, Chinese Traditional, Chinese Simplified, Czech, Polish, Portuguese-Brazil, Russian, Turkish
Type	Package management system
License	Freeware
Website	www.microsoft.com/web/downloads/platform.aspx

Web Platform Installer (Web PI) was a freeware, closed-source package management system that installs non-commercial development tools and their dependencies that are part of Microsoft Web Platform, including:

The ability to install third-party software was added in version 2.0, released September 24, 2009.^[3] As of July 2015^[update], Web PI can install 82 titles.^[4] Web PI 2.0's options are populated dynamically at runtime from Microsoft's servers, allowing installation options to be updated without the need to download newer versions of the Web PI itself.^[5]

On July 7, 2010, Microsoft announced Web PI 3 which includes WebMatrix, a new set of integrated tools for web development. Web PI 3 installs additional tools for web development including IIS Developer Express, SQL Server Compact and DotNetNuke.

Web PI features an offline mode where products can be downloaded to a local cache on a machine where internet access is available and then use these cached files on a different machine later.^[6] However, Web PI is still not usable in environments where Internet connectivity and local administrator privileges are mutually exclusive (i.e. a given process can either authenticate through a transparent proxy, or can have High or System integrity level, but not both).

The Microsoft Web Platform Installer (WebPI) has been retired since July 1, 2022.^[7]